Which of the following is considered hazardous waste?

Hazardous waste is defined as waste that can pose significant risks to human health or the environment. In the context of dental nursing, sharps, such as needles and scalpel blades, are classified as hazardous waste because they can cause injuries and transmit infections if not disposed of properly. They must be disposed of in specific sharps containers that meet safety standards to prevent accidents and ensure safe handling.

The other options, while they may have their own disposal considerations, do not meet the criteria for hazardous waste specific to the dental environment. Electronics can contain hazardous materials, but they are typically managed under different waste management regulations. Plastic packaging and food waste are not classified as hazardous, as they do not have the same potential for injury or infection as sharps do in a dental practice.